Which of these is not required for organic molecules to be transformed into usable fossil fuels such as coal and oil?
a) the sun
b) long periods of time.
c) great amounts of pressure
d) a large supply of dead, organic material

The ph of carrots are 5.0 how it is classified a.acidic b.basic c.indicator d.neutral

Element before carbon on the periodic table

15. which of the following is not human-caused groundwater pollution? a. water in an aquifer dissolves elements such as arsenic and mercury from surrounding rock. b. water in an aquifer is contaminated by leachate that seeps into the ground from a landfill. c. water in an aquifer becomes polluted with chemicals used in hydraulic fracturing, or fracking. d. water in an aquifer absorbs harmful bacteria from the drainage field of a septic tank.